The nail is inserted into the interior of a long tubular bone. It has a plurality of elongate segments joined to the leading end of its tubular sheath. When the segments are urged through a segment guiding device that is positioned at the leading end of the sheath, the segments with their sharpened bone penetrating distal ends exit in a radial distal direction causing them to lock into the surrounding bone. During the distal translation of the sheath and the elongate segments, the segment guiding means is maintained in a fixed position relative to the surrounding bone by the centrally placed shaft of a setting tool.
